Vs Sub, you can react to ice ball and choose your time to glow there. And once it's up, we'll have more freedom, since now low projectile is much less risky to throw out. This is how you want to activate glow on most characters who will try to zone Jade (unless you AMP air glaive and they block it from a reasonable distance or their gap closer specials aren't too great). If you are V1, losing out on straight glaive isn't a total loss. V2, however, I can see this being troublesome. But generally, this is a matchup where air glaive definitely shouldn't be done on autopilot.
The risk on air glaive is indeed a factor, but a big thing to consider is that the Sub definitely must be reading that you won't AMP air glaive at, like, the peak of your jump, and even then, if he's too slow, he's getting hit and you can take that time to glow, since you are very plus on hit at that point.
124 is -6. If they are going for a throw and you scout this, their chin should be ROCKED. 212 being in d4 range is tricky. I need to actually test, but I'm pretty sure jump back ia air glaive can check someone mashing d4 here. I don't think all hope is lost.
Jade's speed isn't really bad, tbh. She has it better in fastest standing mid department than a few characters out there (there's characters who don't get a mid until 14f). Mids in general are fairly slow, and not many can actually lay claim to a sub-10f mid, and her jabs are the typical 7-8f ones for those particular punishes. Also, having a solid d4 herself is good because Sub has his b143 string (I think hers actually outspeeds Sub's if it's the same speed as Scorp's). Vs V1, ice ball can be a problem because we have to scout, but Sub has to also be aware that we have a few ways around it and can even ignore it for periods of time, and will have to do his own scouting.
This is all I picked up from my one ranked set vs titaniumtigerz, so it's very initial impressions. But it didn't seem as dire as advertised here.
